Pulsatory percussive drill.



L. c. BAYLES. PULSATORY PERCUSSIVE DRILL.

APPLICATION FILEDJUNE 29, |912.

Zgg Patented July 6, 1915.

parrain srares ramena ermee.

LEWIS CONDICT BAYLES, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-'RAND COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

PULSATORY-PERCUSSIVE DRILL. l

To all whom t may concern y Be it known that I, Lnwrs C. Barinas, a citizen of the United States, residing in Easton, in the county of Northampton and State of Pennsylvania, have invented certain new and useful Improvements in Pulsatory PercussiveDrills, of which the following is a speciication.

This invention relates to percussive drills and more particularly to that type of drill wherein the piston is reciprocated by pulsations produced by a reciprocating pump or compressor directly connected with the drill cylinder.'

One object of the present invention is to produce a drilling mechanism of this type of great simplicity and great elliciency and a further object is to so construct such a drill that air from the drill may be conveyed through the drill steel to effectively remove rock cuttings and dust therefrom.

With these objects in view I have devised a drilling\ mechanism a practical embodiment of lwhich is shown in the accompanying` drawing in which the, figure shows a sidel- View of the drilling mechanism partly in section and partly in elevation.

rl`he drill itself as shown comprises a cylinder 1 in which reciprocates a piston 2 the forward part of which is reduced in diameter :forming .a shank?) which slides in' fa sleeve 4; of smallerl diameter than the main cylinder. In the sleeve- 4: are'. the cylinn drical holes or chambers', ywhich',fopeninto the forward'part of the cylinder l forming a` part'thereof. A port 6' opens from the main part of the cylinder atapointjust uncovered by the piston at the end of its forward 'stroke' and from this port a passage 7 leads to the forward end of the cylinder to the other side of the large diameter portion of the piston. In the passage 7 is seated a spring pressed plate check valve 8 which allows fluid to pass from the back to the front end of the cylinder but not in the reverse direction. Forward of the-cylinder is a front head 9 inwhich is rotatably mounted a steel holding sleeve l0 which is adapted'to hold the hollow drill steel 11. The extreme forward part of the piston is provided with spiral' flutes 12 which slide in a similarly grooved bushing in the rear end of the steel holding sleeve 10. The piston has a central bore 14, 'the fcrward part ci' which is or smaller diameter and reg- Specication of Letters Patent.

Patented July 6, 11915.

.application leid .Tune 29, 1912. Serial No. 706,608.

isters with the bore in the drill steel 11 and the rear portion of which is of larger diameter and is provided in its rearmost end with a grooved bushing 15 in which slides a rifle bar 16 which rotates in the back head.

of the drill and is provided with a ratchet rotating mechanism 17 of ordinary construction. The rie bar 16 and the bushing l5 are more or less loosely fitted so that there is acertain amount of room for leakage from the back part of the cylinder through the bore of the piston. From the chamber 5 ports 18 open into the interior of sleeve 4 at a point cleared by the smooth portion of the smaller diameter part. 3 of the piston at the end of its rearward stroke.

Atthe rear ehd of the cylinder isa port.

1'9 which leads by a pipe 20 to the driving pump or compressor of the drill. This comprises as shown a cylinder 2l in which reciprocates a piston 22, the upper end of the cylinder being in ldirect communication with the pipe 20. The lower part ofthe piston and cylinder are of larger diameter forming in elect a second cylinder and piston which'operate as a pump for orcingair into the drill'operating portion of the cylinder, air being taken in o n 'the down stroke through the plate valve 23 and forced into the drill operating portion of the'cylinder on the up stroke through a plate valve 24 and a 'passage 25. The piston 22 isreciprocated by ordinary crank means (not shown) through a' reduction gear 26, ofordinary construction (not shownl in detail) and motor 27 mounted on a wheeled truck 28.v

In operation the reciprocation of the piston 22 causes a corresponding reciproca-tion of the piston 2, the up stroke of the piston,v

22 causing the piston 2 to move forwardly striking a blow on the drill steel. At the end of the forward stroke of the piston 2 lll@ " tions of the cylinder 21 and piston 22'i-ai's pump being of such capacity that the co pression in the drill cylinder is constant v maintained considerably above atmospheric pressure. It is to be noticedthat this pump delivers its air to the drill cylinder during the whole forward stroke of the piston 2, in this way adding to the force of the blow of the piston. If the air were delivered to the drill cylinder on its backwardstroke it is apparent that the backward motion of the piston 2 would be considerably retarded.

By the use of the present.' construction a heavy and efficient blow is given to the drill steel and an ample suply of air forced through the drill steel to e ciently clear the hole, ther being a small constant flow through eaka ge around the rifle bar through the piston and a periodically greater flow of a momentary and sudden nature through the ports 18 at the end of each back stroke of the piston 2.

It is to be understood that the presentv showing and description discloses only one specified modiiication of my invention and other forms'and' modifications yare included in the spirit and scope of the invention as` supplying additional fluid lutweenl saidV drlvlngfand driven pistons during the forward stroke of'said driven piston.

2. In combination, a driving cylinder and piston, apercussive tool comprising a cylbinder andal piston driven `by the pulsations of said drivingpiston, a hollow drill steel, aA bore through said driven piston communicating with said hollow drill steel, a rifle bar loosely engaging the rear end of the piston lbore and admitting air from the rea?l y end of the lcylinder to said hollow drill steel, c

and` pumping means for supplying addil tional fluid between said driving and driven piston's during `the forward stroke of said driven piston. LEWIS CONDICT BAYLES.

c Witnesses f EMisrE'r'r S. Arena,

ROBERT E. KIEFFER.

Copies of this patent may be obtained vfor ve cents each; by addressing Vthe Commissioner of Patents,

Washington, D. C. 

